<?php  $image = "jiequ.jpg"; // 原图  $imgstream = file_get_contents($image);  $im = imagecreatefromstring($imgstream);  $x = imagesx($im);//获取图片的宽  $y = imagesy($im);//获取图片的高    // 缩略后的大小  $xx = 140;  $yy = 200;    if($x>$y){  //图片宽大于高      $sx = abs(($y-$x)/2);      $sy = 0;      $thumbw = $y;      $thumbh = $y;  } else {  //图片高大于等于宽      $sy = abs(($x-$y)/2.5);      $sx = 0;      $thumbw = $x;      $thumbh = $x;    }  if(function_exists("imagecreatetruecolor")) {    $dim = imagecreatetruecolor($yy, $xx); // 创建目标图gd2  } else {    $dim = imagecreate($yy, $xx); // 创建目标图gd1  }  imageCopyreSampled ($dim,$im,0,0,$sx,$sy,$yy,$xx,$thumbw,$thumbh);  header ("Content-type: image/jpeg");  imagejpeg ($dim, false, 100);  ?>